start with Hydrogen already,
Afaik, Hydrogen fuel cells simply have too many problems to be feasible right now, among them:
-Current methods to convert H2 from Natural gas or coal are simply too expensive.
-Conversions are for your car are too expensive
-High pressure storage tanks for the H2 in your car are dangerous
I just heard on a radio program that there is a relatively cheap way to make methonal from coal. Good things they said about it:
-The U.S. has enough coal to make coal-based methanol cheaply for the next 500 years.
-Cost almost nothing--from the manufacturer--to make a car "flex fuel" or able to run on regular gas/coal-based methanol.
-It would cost $1.77/gallon
Biggest downside is that coal mines are dangerous/dirty for employees and the environment.
Mass transit is not the most feasible option for the United States, since we simply have so much land mass. Believe me, I and everyone else would love it if we could take a train accross the country, and to any other state for a couple bucks, but it's simply not feasible here.
Canada has the largest amount of Oil on the Earth.
I never Knew that, and woud've thought Russia...wow!